Cannot Save and Delete Data from Preferences in the Same Function

Projects Programming
7

If you set BREAK_THE_CODE = true (e.g. removing the delay caused by the printPreferences() call, this is the contents of Preferences after the addition of launcher_id=9:

    {1: 01:02:03:04:05:06}, {010203040506: 1}
	{3: 03:05:04:03:02:01}, {030504030201: 3}
	{8: 08:05:04:03:02:01}, {080504030201: 8}
	{9: }, {080504030201: 8}

Note that the MAC address string is not saved for the first entry, and the second entry has totally incorrect data.